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D( x )
10*x-10 = 0
5*x+5 = 0
10*x-10 = 0
10*x-10 = 0
10*x-10 = 0 // + 10
10*x = 10 // : 10
x = 10/10
x = 1
5*x+5 = 0
5*x+5 = 0
5*x+5 = 0 // - 5
5*x = -5 // : 5
x = -5/5
x = -1
x in (-oo:-1) U (-1:1) U (1:+oo)
(((3*x-3)/(5*x+5))*(14*x+14))/(10*x-10) = 0
((3*x-3)*(14*x+14))/((5*x+5)*(10*x-10)) = 0
( 14*x+14 )
14*x+14 = 0 // - 14
14*x = -14 // : 14
x = -14/14
x = -1
( 3*x-3 )
3*x-3 = 0 // + 3
3*x = 3 // : 3
x = 3/3
x = 1
x in { -1}
x in { 1}
x belongs to the empty set
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